Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 560 · 40 questions

Robot tip (Find the topic, use the formula): Find the topic: moving, motors, gears, wheels, sensors, echo, line or gyro. Use the rule: teeth × turns; circumference × turns; 17 cm per ms of echo; below the threshold = black; right adds degrees. Check: put your answer back into the rule.

1. 1.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) slower but stronger (c) faster and weaker (d) at the same speed
2. 2.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
3. 3.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) goes straight forward (b) turns left (c) spins left on the spot (d) spins right on the spot
4. 4.🧭 A robot faces south. It does: turn right, turn around, turn left, turn around. Which way does it face now? (a) south (b) west (c) east (d) north
5. 5.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
6. 6.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
7. 7.Which job needs a camera? (a) hear a whistle (b) measure a turn angle (c) read a QR code (d) find the brightest spot
8. 8.🧭 A robot spins 15° every second. How many seconds does it take to turn 345°?
9. 9.Which of these suits propellers? (a) soft snow (b) a smooth classroom floor (c) hovering over a roof (d) loose sand dunes
10. 10.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) turns right (b) stays still (c) goes straight forward (d) goes straight back
11. 11.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 180° (c) 360° (d) 45°
12. 12.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) number of gears (c) motor volts (d) wheel size
13. 13.True or false: to measure a turn angle, use a camera. (a) True (b) False
14. 14.Which of these suits wheels? (a) a field of tall boulders (b) a smooth classroom floor (c) deep mud (d) flying over a field
15. 15.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
16. 16.⚙️ What are the bumps round the edge of a gear called? (a) teeth (b) tyres (c) pins (d) spokes
17. 17.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
19. 19.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they climb stairs (c) they float (d) fast and easy on floors
20. 20.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 37. What is under the sensor? (a) the white floor (b) the black line
21. 21.⬛ A reading below the threshold means the sensor is over … (a) white (b) the sky (c) black (d) water
22. 22.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 616 cm?
23. 23.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 65. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the left sensor (d) the right sensor
24. 24.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
25. 25.🧭 How many degrees is a full turn? (a) 360° (b) 100° (c) 180° (d) 90°
26. 26.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle + 10
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
27. 27.⬛ The threshold of a light sensor is … (a) the wheel size (b) the top speed (c) the battery size (d) the black/white cut-off
28. 28.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
29. 29.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
30. 30.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they are too cheap (c) harder to balance (d) they never tire
31. 31.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) tracks (b) wheels (c) propellers (d) legs
32. 32.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
33. 33.🧭 A robot keeps turning right by 45° at a time. How many turns make one full circle?
34. 34.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
35. 35.🔍 What does a gyro sensor measure? (a) colour (b) sound (c) temperature (d) turning (rotation)
36. 36.🧭 A robot should turn right 45°, but its gyro shows it turned 34°. How many degrees must it turn more to the right?
37. 37.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 270°. It turns right 135°, then right 180°, then right 45°. What does the gyro read now (0° to 359°)?
38. 38.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
39. 39.Which job needs a distance sensor? (a) read a QR code (b) follow a black line (c) feel a bump into a wall (d) measure how far a box is
40. 40.⚙️ An 8-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?

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